CN101222597A - Method and apparatus for detecting/correcting errors - Google Patents

Abstract

The invention provides a method for detecting/correcting errors of first data and second data. The first data and the second data are respectively equal to or related to the original data. The original check code is generated in advance according to the original data and an algorithm. The first check code and the third check code are respectively equal to or related to the original check code. The method first generates a second check code according to the first data and the algorithm, and generates a fourth check code according to the second data and the algorithm. Then, the method compares the first check code with the second check code, and compares the third check code with the fourth check code. If the first check code is equal to the second check code and the third check code is equal to the fourth check code, the method determines that neither the first data nor the second data are error free.

Description

Method and device for detecting/correcting errors

technical field

The present invention relates to a data processing method and a data processing device, in particular to a data processing method and a data processing device for detecting/correcting errors.

Background technique

High-definition Multimedia Interface (HDMI) is an audio-visual interface standard that has become increasingly popular in recent years. The technology provides sufficient bandwidth to transmit uncompressed audiovisual content from a source device (such as a DVD player or digital TV box) to a high-resolution playback device (such as a TV or projector) over a single cable . Generally speaking, one HDMI cable can replace ten to twelve analog transmission cables. Therefore, in addition to accommodating high-quality multimedia signals, HDMI also has the advantage of simple lines.

In order to prevent unauthorized copying of copyrighted multimedia content, several software and hardware manufacturers have jointly launched a copyright protection protocol that can be matched with the HDMI specification - High-bandwidth Digital Content Protection (High-bandwidth Digital Content Protection). , HDCP).

According to the HDCP protocol, both the source device and the playback device must each have an HDCP key (secret device key). This key consists of 40 password arrays of 56 bits. Before transmitting the multimedia signal, the source device and the playback device first exchange keys with each other, and perform calculations based on the keys. If the calculated results of the two are consistent, the source device can determine that the playback device is a legitimate receiver. After the above confirmation process, the source device will start to transmit the multimedia signal. In other words, various devices such as optical drives, display cards, and monitors in the multimedia system must have HDCP keys, so that the multimedia system can play multimedia files normally. If any device in the multimedia system does not have a built-in HDCP key chip, the quality of the multimedia signal may be greatly reduced, or even cannot be played.

In existing displays, the HDCP key is usually burned into an electrically erasable programmable read only memory (EEPROM). After the user turns on the display, the main control unit (MCU) in the display will first read the HDCP key from the EEPROM, and then send the HDCP key to the subsequent processing unit.

However, in addition to the HDCP key, the display's EEPROM typically also stores user data and certain settings for the display. Because the MCU may frequently read and write the EEPROM, it may cause errors in the data in the EEPROM. Once the HDCP key is incorrect, the display cannot receive multimedia signals correctly and may display abnormal images.

In the prior art, when a user finds an abnormal phenomenon on the screen of the display, it is impossible to know whether the abnormal phenomenon is caused by an error in the HDCP key.

Contents of the invention

To solve the above problems, the present invention provides a method and device for detecting/correcting errors. The error detection/correction method and device according to the present invention can be used to judge whether the HDCP key is wrong, and can also try to correct the error when the HDCP key is wrong. If the error is too severe to be corrected, the method and apparatus according to the present invention can display an error message to inform the user that the HDCP key is incorrect.

According to the present invention, the correct HDCP key can be regarded as raw data. In an embodiment according to the present invention, the original data is firstly copied into first data and second data. The first data and the second data are simultaneously stored in one memory or respectively stored in two different memories. Initially, before being damaged, both the first data and the second data are equal to the original data. After a period of time, the first data and/or the second data may be damaged due to frequent reading and writing of the memory, that is, they are different from the original data.

In addition, the original checksum is generated in advance according to the original data and the algorithm. This original checksum is copied as a first checksum and a third checksum. The first check code and the third check code are also stored in the above at least one memory. Similarly, before being damaged, both the first checksum and the third checksum are equal to the original checksum. After a period of time, the first checksum and/or the third checksum may also be damaged due to frequent reading and writing of at least one memory, that is, they are different from the original checksum.

A preferred embodiment according to the present invention is a method for detecting/correcting errors of the first data and the second data. The method first generates a second check code according to the first data and the algorithm, and generates a fourth check code according to the second data and the algorithm. Next, the method compares the first check code with the second check code, and compares the third check code with the fourth check code.

Theoretically, if neither the first data nor the first checksum is damaged, the second checksum should be equal to the first checksum. Similarly, if neither the second data nor the third check code is damaged, the fourth check code should be equal to the third check code. Therefore, if the first check code is equal to the second check code, and the third check code is equal to the fourth check code, then the method determines that both the first data and the second data are error-free.

Furthermore, if the first check code is equal to the second check code and the third check code is not equal to the fourth check code, then the method determines that there is no error between the first data and the first check code. The second data and/or the third check code are then determined to be erroneous. Therefore, the method replaces the second data with the first data, and replaces the third check code with the first check code.

Conversely, if the first check code is not equal to the second check code and the third check code is equal to the fourth check code, the method replaces the first data with the second data and replaces the third check code with the third check code. First checksum.

In addition, if the first check code is not equal to the second check code and the third check code is not equal to the fourth check code, the method may further compare the second check code with the third check code. If the second check code is equal to the third check code, the method determines that the first data and the third check code are correct, and the second data and the first check code are judged to have errors. Therefore, the method replaces the second data with the first data, and replaces the first check code with the third check code.

If the second check code is also not equal to the third check code, the method may further determine whether the first check code is equal to the fourth check code. If the first check code is equal to the fourth check code, the method determines that there is no error between the second data and the first check code. Therefore, the method replaces the first data with the second data, and replaces the third check code with the first check code. In addition, if the first checksum is not equal to the fourth checksum, the method may display an error message to inform the user that an irreparable error has occurred in the data and the checksum.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1(A) and FIG. 1(B) show the condition of the memory before and after an error occurs.

Fig. 2 (A) is the flow chart of the error detection/correction method according to the first preferred embodiment of the present invention; Fig. 2 (B) has shown the error detection/correction method extended from Fig. 2 (A) an example.

3(A)-(C) are block diagrams of an error detection/correction device according to a second preferred embodiment of the present invention.

Fig. 4 is a flowchart of an error detection/correction method according to a third preferred embodiment of the present invention.

FIG. 5 is a block diagram of an error detection/correction apparatus according to a fourth preferred embodiment of the present invention.

Detailed ways

The present invention provides a method and device for detecting/correcting errors. In addition to multimedia systems conforming to the HDCP protocol, the method and device according to the present invention can also be applied to various electronic products that need to prevent digital data errors. For the convenience of explanation, the following embodiments mainly use the HDCP key of the display as the object of error detection/correction.

According to the present invention, the HDCP key of the display can be regarded as raw data. The original check code is generated in advance according to the original data and the algorithm. In practical applications, the original check code may be a checksum (checksum) of the original data. For example, assume that the original data contains nine numbers from 1 to 9 in decimal. The sum of these nine numbers is 45. As is well known to those skilled in the art, the checksum of the original data is 5.

In an embodiment according to the present invention, the original data is firstly copied into first data and second data. The original checksum is copied as a first checksum and a third checksum.

The main control unit of some displays includes flash memory. The first data, the second data, the first check code and the third check code can be stored in the EEPROM of the display at the same time, and can also be stored in the flash memory of the main control unit at the same time. In addition, the first data, the second data, the first check code and the third check code may also be stored in different areas of the EEPROM and/or the flash memory. The storage positions of the first data, the second data, the first check code and the third check code can be determined according to the size of the unused memory space in the EEPROM and the flash memory.

The above-mentioned procedure of generating and storing the first data, the second data, the first check code and the third check code can be executed by the automation equipment in the factory before the display is shipped.

Initially, before being damaged, both the first data and the second data are equal to the original data. After the display is shipped from the factory and used for a period of time, the first data and/or second data may be damaged due to frequent reading and writing of the stored memory (EEPROM and/or flash memory), that is, it is different from the original data. difference.

Likewise, before being damaged, both the first checksum and the third checksum are equal to the original checksum. After a period of time, the first check code and/or the third check code may also be damaged due to frequent reading and writing of the stored memory, that is, they are different from the original check code.

See Figure 1. The examples shown in FIG. 1(A) and FIG. 1(B) are respectively before and after an error occurs in the memory 10 . In this example, the first data, the second data, the first check code and the third check code are respectively stored in the storage areas 11 , 12 , 13 and 14 of the memory 10 . The original data is assumed to contain {1, 2, 3, 4, 5, 6, 7, 8, 9} nine numbers. In addition, this example assumes that the original checksum is the checksum of the original data, so the original checksum is 5.

As shown in FIG. 1(A), before the data in the memory 10 is damaged, both the first data and the second data are equal to the original data, and both the first check code and the third check code are equal to the original check code. Assume that the first data in the storage area 11 and the third checksum in the storage area 14 are destroyed after a large amount of reading and writing of the memory 10 is performed. As shown in FIG. 1(B), the original 5 in the first data is changed to 3, and the third checksum is changed from the original 5 to 7.

A first preferred embodiment according to the present invention is a method for detecting/correcting errors of the first data and the second data. The method can be executed each time the display is turned on. Referring to FIG. 2(A), FIG. 2(A) shows a flowchart for the error detection/correction method.

The method first executes step S200, generating a second check code according to the first data and the algorithm, and generating a fourth check code according to the second data and the algorithm. In this example, the algorithm is to calculate the respective checksums of the first data and the second data. Since the sum of the nine numbers {1, 2, 3, 4, 3, 6, 7, 8, 9} in the first data is 43, the second check code is equal to 3. On the other hand, the sum of the nine numbers {1, 2, 3, 4, 5, 6, 7, 8, 9} in the second data is 45, therefore, the fourth check code is equal to 5. In practical applications, the algorithm may of course be other algorithms for generating error checking codes.

Next, the method executes step S201, comparing the first check code with the second check code. If the judgment result of step S201 is yes, then the method continues to execute step S202 to compare the third check code with the fourth check code. Theoretically, if neither the first data nor the first checksum is damaged, the second checksum should be equal to the first checksum. Similarly, if neither the second data nor the third check code is damaged, the fourth check code should be equal to the third check code. Therefore, if the judgment result of step S202 is also yes, then the method judges in step S203 that both the first data and the second data are correct.

On the other hand, if the determination result of step S202 is no, it means that the second data and/or the third check code are damaged. Therefore, if the judgment result of step S202 is negative, the method will execute step S204 to replace the second data with the first data, and replace the third check code with the first check code.

As shown in FIG. 1(B), in this example, the first checksum is still equal to 5, that is, it has not been damaged. However, the second checksum is 3 because the first data is wrong. Therefore, the determination result of step S201 is NO. In practical applications, if the determination result of step S201 is negative, it means that the first data and/or the first check code have errors.

Next, the method continues to execute step S205, comparing the third check code with the fourth check code. If the judgment result of step S205 is yes, it means that the second data and the third check code are free of errors. Therefore, if the determination result of step S205 is yes, the method will continue to execute step S206 to replace the first data with the second data, and replace the first check code with the third check code.

In the example shown in FIG. 1(B), the third checksum is destroyed, changing from 5 to 7. On the other hand, since the second data has no errors, the fourth checksum is equal to the original checksum, that is, equal to 5. Therefore, the determination result of step S205 is NO. In practical application, if the judgment result of step S205 is negative, it means that the second data and/or the third check code have errors.

If the judgment result of step S205 is negative, the method continues to execute step S207 to judge whether the second check code is equal to the third check code. If the determination result of step S207 is yes, it means that the first data and the third checksum are correct, and the second data and the first checksum are determined to have errors. Therefore, if the determination result of step S207 is yes, the method will execute step S208 to replace the second data with the first data, and replace the first check code with the third check code.

In the example shown in FIG. 1(B), the second check code is equal to 3, and the third check code is equal to 7, which are not equal. Therefore, the determination result of step S207 is NO. Next, the method continues to execute step S209, comparing the first check code with the fourth check code.

If the determination result of step S209 is yes, it means that there is no error between the second data and the first check code. The first data and the third check code are determined to be incorrect. Therefore, the method will execute step S210 to replace the first data with the second data, and replace the third check code with the first check code.

In the example shown in FIG. 1(B), both the first check code and the fourth check code are equal to 5. Therefore, the method will replace the first data in the storage area 11 with the second data in the storage area 12, and replace the third check code in the storage area 14 with the first check code in the storage area 13, thereby achieving correction wrong effect. After correction, both the first data and the second data are equal to the original data, and both the first check code and the third check code are equal to the original check code.

If the result of step S209 is negative, it means that both the first data and the second data are wrong, or at least three of the four storage areas 11 , 12 , 13 and 14 have errors. In this case, the method will execute step S211 to display an error message, informing the user that an irreparable error occurs in the data and the checksum.

See Figure 2(B). FIG. 2(B) shows an embodiment extended from the error detection/correction method in FIG. 2(A). The main difference between this embodiment and the error detection/correction method shown in FIG. 2(A) is that step S204 of FIG. 2(A) is replaced by steps S204A～S204C of FIG. Step S206 in FIG. 2(B) is replaced by steps S206A to S206C in FIG. 2(B).

As mentioned above, if the determination result of step S202 is negative, it means that the second data and/or the third check code are damaged. As shown in FIG. 2(B), if the determination result of step S202 is negative, the embodiment executes step S204A to determine whether the second check code is equal to the fourth check code. If the determination result of step S204A is yes, it means that the second data has no error, and only the third checksum is damaged. Therefore, if the determination result of step S204A is yes, the embodiment continues to execute step S204B to replace the third check code with the first check code.

On the contrary, if the determination result of step S204A is no, it means that the second data is damaged, and the third check code may not be wrong. Therefore, if the determination result of step S204A is negative, the embodiment continues to execute step S204C to replace the second data with the first data, and replace the third check code with the first check code.

On the other hand, if the judgment result of step S205 is yes, it means that the second data and the third checksum are free of errors, but the first data and/or the first checksum are damaged. As shown in FIG. 2(B), if the determination result of step S205 is yes, the embodiment executes step S206A to determine whether the second check code is equal to the fourth check code. If the judgment result of step S206A is yes, it means that the first data has no error, and only the first checksum is damaged. Therefore, if the determination result of step S206A is yes, the embodiment continues to execute step S206B, replacing the first check code with the third check code.

On the contrary, if the determination result of step S206A is no, it means that the first data is damaged, and the first check code may not be wrong. Therefore, if the determination result of step S206A is negative, the embodiment continues to execute step S206C to replace the first data with the second data and replace the first check code with the third check code.

The error detection/correction methods shown in FIG. 2(A) and FIG. 2(B) can be executed every time the display is turned on, or can be executed at regular intervals. The method can be used to judge whether the HDCP key is wrong, and can also correct the error in real time when the HDCP key is wrong. If the error is too severe to be corrected, the method and apparatus according to the present invention can display an error message to inform the user that the HDCP key is incorrect.

A second preferred embodiment according to the present invention is an apparatus for detecting/correcting errors of the first data and the second data. Referring to FIG. 3(A), FIG. 3(A) shows a block diagram of the error detection/correction device. The error detection/correction device 30 includes a calculation module 31 , a first comparison module 32 , and a judgment module 33 . Error detection/correction device 30 may be used in conjunction with memory 10 shown in FIG. 1 .

The calculating module 31 is used for generating a second check code according to the first data, and generating a fourth check code according to the second data. The first comparison module 32 is used for comparing the first check code with the second check code, and comparing the third check code with the fourth check code. If the comparison result of the first comparison module 32 shows that the first check code is equal to the second check code, and the third check code is equal to the fourth check code, then the judging module 33 judges that the first data and the second data are both It is equal to the original data, that is, both the first data and the second data are error-free.

If the comparison result of the first comparison module 32 shows that the first check code is equal to the second check code, and the third check code is not equal to the fourth check code, then the judging module 33 replaces the second data with the first data , and replace the third checksum with the first checksum.

On the other hand, if the comparison result of the first comparison module 32 shows that the first check code is not equal to the second check code, and the third check code is equal to the fourth check code, then the judging module 33 replaces the second check code with the second data. The first data, and the first check code is replaced by the third check code.

Referring to FIG. 3(B), the error detection/correction device 30 may further include a second comparison module 34 and a third comparison module 35 . If the comparison result of the first comparison module 32 shows that the first check code is equal to the second check code, and the third check code is not equal to the fourth check code, then the second comparison module 34 compares the second check code with the second check code. Fourth checksum. If the comparison result of the first comparison module 32 shows that the first check code is not equal to the second check code, and the third check code is equal to the fourth check code, then the third comparison module 35 compares the second check code with the second check code. Fourth checksum.

If the comparison result of the second comparison module 34 shows that the second check code is equal to the fourth check code, the judging module 33 replaces the third check code with the first check code. If the comparison result of the second comparison module 34 shows that the second check code is not equal to the fourth check code, the judging module 33 replaces the second data with the first data, and replaces the third check with the first check code. code.

If the comparison result of the third comparison module 35 shows that the second check code is equal to the fourth check code, the judging module 33 replaces the first check code with the third check code. If the comparison result of the third comparison module 35 shows that the second check code is not equal to the fourth check code, the judging module 33 replaces the first data with the second data, and replaces the first check with the third check code. code.

In practical applications, the error detection/correction device 30 may also be shown in FIG. 3(C), further comprising a fourth comparison module 36 and a fifth comparison module 37, and a display module 38.

If the comparison result of the first comparison module 32 shows that the first check code is not equal to the second check code, and the third check code is not equal to the fourth check code, then the fourth comparison module 36 compares the second check code with the second check code. The third checksum. If the comparison result of the fourth comparison module 36 shows that the second check code is equal to the third check code, the judging module 33 replaces the second data with the first data, and replaces the first check code with the third check code. .

If the comparison result of the fourth comparison module 36 shows that the second check code is not equal to the third check code, then the fifth comparison module 37 compares the first check code with the fourth check code. If the comparison result of the fifth comparison module 37 shows that the first check code is equal to the fourth check code, the judging module 33 replaces the first data with the second data, and replaces the third check with the first check code. code.

If the comparison result of the fifth comparison module 37 shows that the first checksum is not equal to the fourth checksum, the display module 38 displays an error message to inform the user that an irreparable error occurs between the data and the checksum.

The third preferred embodiment according to the present invention is also a method for detecting/correcting errors of the first data and the second data. Referring to FIG. 4, FIG. 4 shows a flowchart of the error detection/correction method. In this embodiment, original data is first copied as first data and second data. The original checksum is copied as the fifth checksum. Initially, before being damaged, both the first data and the second data are equal to the original data. Likewise, before being damaged, the fifth checksum is equal to the original checksum.

In this embodiment, the method first executes step S400, generating a sixth check code according to the first data and the algorithm, and generating a seventh check code according to the second data and the algorithm. Next, the method executes step S401, comparing the fifth check code with the sixth check code.

If the determination result of step S401 is yes, it means that there is no error between the first data and the fifth check code. Next, the method executes step S402, comparing the fifth check code with the seventh check code. If the determination result of step S402 is also yes, it means that the second data has not been destroyed. Therefore, the method determines in step S403 that both the first data and the second data are correct.

On the contrary, if the determination result of step S402 is no, it means that the second data is wrong. Therefore, if the judgment result of step S402 is negative, the method proceeds to step S404 to replace the second data with the first data, so as to correct the error.

If the determination result of step S401 is no, the method executes step S405 to compare the fifth check code with the seventh check code. If the determination result of step S405 is yes, the method executes step S406 to replace the first data with the second data.

On the other hand, if the judgment result of step S405 is negative, the method executes step S407 to judge whether the sixth check code is equal to the seventh check code. If the determination result of step S407 is yes, it means that the first data and the second data are not damaged, but the fifth checksum has an error. Therefore, if the determination result of step S407 is yes, the method proceeds to step S408 to replace the fifth check code with the sixth check code.

On the contrary, if the determination result of step S407 is no, it means that at least two of the first data, the second data, and the fifth check code are wrong. In this case, the method will execute step S409 to display an error message, informing the user that an irreparable error has occurred in the data and the checksum.

A fourth preferred embodiment according to the invention is an apparatus for error detection/correction. Referring to FIG. 5, FIG. 5 shows a block diagram of the error detection/correction device. The error detection/correction device 50 includes a calculation module 51 , a first comparison module 52 , a judgment module 53 , a second comparison module 54 , and a display module 55 . In this embodiment, original data is first copied as first data and second data. The original checksum is copied as the fifth checksum. The first data, the second data, and the fifth check code are all stored in the memory 60 . Initially, before being damaged, both the first data and the second data are equal to the original data. Likewise, before being damaged, the fifth checksum is equal to the original checksum.

The calculating module 51 is used for generating a sixth check code according to the first data, and generating a seventh check code according to the second data. The first comparison module 52 is used for comparing the fifth check code with the sixth check code, and comparing the fifth check code with the seventh check code. If the comparison result of the first comparison module 52 shows that the fifth check code is equal to the sixth check code, and the fifth check code is equal to the seventh check code, then the judging module 53 judges that the first data and the second data are both It is equal to the original data, that is, both the first data and the second data are error-free.

If the comparison result of the first comparison module 52 shows that the fifth check code is equal to the sixth check code, and the fifth check code is not equal to the seventh check code, then the judging module 53 replaces the second data with the first data . If the comparison result of the first comparison module 52 shows that the fifth check code is not equal to the sixth check code, and the fifth check code is equal to the seventh check code, then the judging module 53 replaces the first data with the second data .

If the comparison result of the first comparison module 52 shows that the fifth check code is not equal to the sixth check code, and the fifth check code is not equal to the seventh check code, then the second comparison module 54 compares the sixth check code with The seventh checksum. If the comparison result of the second comparison module 54 shows that the sixth check code is equal to the seventh check code, the judging module 53 replaces the fifth check code with the sixth check code. In addition, if the comparison result of the second comparison module 54 shows that the sixth checksum is not equal to the seventh checksum, the display module 55 displays an error message to inform the user that an irreparable error occurs between the data and the checksum.

Through the above judging mechanism, the error detection/correction method and device of the present invention can judge whether the HDCP key stored in the display is wrong, and can also try to correct the error when the HDCP key is wrong. Compared with the known technology, the method and device of the present invention can not only reduce the probability of irreparable HDCP key error, but also inform the user of HDCP key error when the error is too serious to be corrected.

In addition to multimedia systems conforming to the HDCP protocol, the method and device according to the present invention can also be applied to various electronic products that need to prevent digital data errors.

Through the detailed description of the above preferred specific embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, rather than the scope of the present invention is limited by the preferred specific embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent replacements within the scope of the claims of the present invention.

Explanation of main component symbols

10: Storage 11, 12, 13, 14: Storage area

S200～S211: Process steps S204A～S204C: Process steps

S206A～S206C: process steps 30, 50: error detection/correction device

31, 51: Calculation module 32, 52: The first comparison module

33, 53: judgment module 34, 54: second comparison module

35: The third comparison module 36: The fourth comparison module

37: Fifth comparison module 38, 55: Display module

S400～S409: Process steps 60: Storage

Claims (25)

1. method that the mistake that is used at first data and second data detects/corrects, described first data equate originally with described second data, first check code produces after to described first data operation according to algorithm, the 3rd check code produces after to described second data operation according to described algorithm, described first check code equates originally with described the 3rd check code, described first data, described second data, described first check code and described the 3rd check code are stored in the device, and described method comprises:

(a) described device produces second check code according to described first data and described algorithm, and produces the 4th check code according to described second data and described algorithm;

(b) more described first check code of described device and described second check code, and more described the 3rd check code and described the 4th check code; And

(c) if described first check code equals described second check code, and described the 3rd check code equals described the 4th check code, and then this device is not revised and continued to store described first data, described second data, described first check code and described the 3rd check code.

2. method according to claim 1, described method further comprises:

(d) if described first check code equals described second check code, and described the 3rd check code is not equal to described the 4th check code, and then described device replaces described second data with described first data, and replaces described the 3rd check code with described first check code.

3. method according to claim 1, described method further comprises:

(e1) if described first check code equals described second check code, and described the 3rd check code is not equal to described the 4th check code, and then described device judges whether described second check code equals described the 4th check code;

(e2) if the judged result of step (e1) is for being that then described device replaces described the 3rd check code with described first check code; And

(e3) if the judged result of step (e1) is that then described device does not replace described second data with described first data, and replaces described the 3rd check code with described first check code.

4. method according to claim 1, described method further comprises:

(f) if described first check code is not equal to described second check code, and described the 3rd check code equals described the 4th check code, and then described device replaces described first data with described second data, and replaces described first check code with described the 3rd check code.

5. method according to claim 1, described method further comprises:

(g1) if described first check code is not equal to described second check code, and described the 3rd check code equals described the 4th check code, and then described device judges whether described second check code equals described the 4th check code;

(g2) if the judged result of step (g1) is for being that then described device replaces described first check code with described the 3rd check code; And

(g3) if the judged result of step (g1) is that then described device does not replace described first data with described second data, and replaces described first check code with described the 3rd check code.

6. method according to claim 1, described method further comprises:

(h1) if described first check code is not equal to described second check code, and described the 3rd check code is not equal to described the 4th check code, and then described device judges whether described second check code equals described the 3rd check code; And

(h2) if the judged result of step (h1) is for being that then described device replaces described second data with described first data, and replaces described first check code with described the 3rd check code.

7. method according to claim 6, described method further comprises:

(h3) if the judged result of step (h1) is that then described device does not judge whether described first check code equals described the 4th check code; And

(h4) if the judged result of step (h3) is for being that then described device replaces described first data with described second data, and replaces described the 3rd check code with described first check code.

8. method according to claim 7, described method further comprises:

(i) if the judged result of step (h3) is not, then described device shows error message.

9. device that the mistake that is used at first data and second data detects/corrects, described first data equate originally with described second data, first check code produces after to described first data operation according to algorithm, the 3rd check code produces after to described second data operation according to described algorithm, described first check code equates originally that with described the 3rd check code described device comprises:

Memory module, described memory module are used to store described first data, described second data, described first check code and described the 3rd check code;

Computing module, described computing module are used for producing second check code according to described first data and described algorithm, and produce the 4th check code according to described second data and described algorithm;

First comparison module, described first comparison module are used for more described first check code and described second check code, and more described the 3rd check code and described the 4th check code; And

Judge module, if the comparative result of described first comparison module shows described first check code and equals described second check code, and described the 3rd check code equals described the 4th check code, the described memory module of controlling then described judge module continues to store described first data, described second data, described first check code and described the 3rd check code, and does not revise described first data, described second data, described first check code and described the 3rd check code.

10. device according to claim 9, wherein, if the comparative result of described first comparison module shows described first check code and equals described second check code, and described the 3rd check code is not equal to described the 4th check code, then described judge module replaces described second data with described first data, and replaces described the 3rd check code with described first check code.

11. device according to claim 9, described device further comprises:

Second comparison module, if the comparative result of described first comparison module shows described first check code and equals described second check code, and described the 3rd check code is not equal to described the 4th check code, more described second check code of then described second comparison module and described the 4th check code; If the comparative result of described second comparison module shows described second check code and equals described the 4th check code that then described judge module replaces described the 3rd check code with described first check code; If the comparative result of described second comparison module shows described second check code and is not equal to described the 4th check code that then described judge module replaces described second data with described first data, and replaces described the 3rd check code with described first check code.

12. device according to claim 9, wherein, if the comparative result of described first comparison module shows described first check code and is not equal to described second check code, and described the 3rd check code equals described the 4th check code, then described judge module replaces described first data with described second data, and replaces described first check code with described the 3rd check code.

13. device according to claim 9, described device further comprises:

The 3rd comparison module, if the comparative result of described first comparison module shows described first check code and is not equal to described second check code, and described the 3rd check code equals described the 4th check code, more described second check code of then described the 3rd comparison module and described the 4th check code; If the comparative result of described the 3rd comparison module shows described second check code and equals described the 4th check code that then described judge module replaces described first check code with described the 3rd check code; If the comparative result of described the 3rd comparison module shows described second check code and is not equal to described the 4th check code that then described judge module replaces described first data with described second data, and replaces described first check code with described the 3rd check code.

14. device according to claim 9, described device further comprises:

The 4th comparison module, if the comparative result of described first comparison module shows described first check code and is not equal to described second check code, and described the 3rd check code is not equal to described the 4th check code, more described second check code of then described the 4th comparison module and described the 3rd check code; If the comparative result of described the 4th comparison module shows described second check code and equals described the 3rd check code that then described judge module replaces described second data with described first data, and replaces described first check code with described the 3rd check code.

15. device according to claim 14, described device further comprises:

The 5th comparison module is not equal to described the 3rd check code if the comparative result of described the 4th comparison module shows described second check code, more described first check code of then described the 5th comparison module and described the 4th check code; If the comparative result of described the 5th comparison module shows described first check code and equals described the 4th check code that then described judge module replaces described first data with described second data, and replaces described the 3rd check code with described first check code.

16. device according to claim 15, described device further comprises:

Display module is not equal to described the 4th check code if the comparative result of described the 5th comparison module shows described first check code, and then described display module shows error message.

17. method that the mistake that is used at first data and second data detects/corrects, described first data equate originally with described second data, the 5th check code produces after to described first data operation according to algorithm, described first data, described second data and described the 5th check code are stored in the device, and described method comprises:

(a) described device produces the 6th check code according to described first data and described algorithm, and produces the 7th check code according to described second data and described algorithm;

(b) more described the 5th check code of described device and described the 6th check code, and more described the 5th check code and described the 7th check code; And

(c) if described the 5th check code equals described the 6th check code, and described the 5th check code equals described the 7th check code, and then described device is not revised and continued to store described first data, described second data and described the 5th check code.

18. method according to claim 17, described method further comprises:

(d) if described the 5th check code equals described the 6th check code, and described the 5th check code is not equal to described the 7th check code, and then described device replaces described second data with described first data.

19. method according to claim 17, described method further comprises:

(e) if described the 5th check code is not equal to described the 6th check code, and described the 5th check code equals described the 7th check code, and then described device replaces described first data with described second data.

20. method according to claim 17, described method further comprises:

(f1) if described the 5th check code is not equal to described the 6th check code, and described the 5th check code is not equal to described the 7th check code, and then described device judges whether described first data equal described second data;

(f2) if the judged result of step (f1) is for being that then described device replaces described the 5th check code with described the 6th check code; And

(f3) if the judged result of step (fl) is not, then described device shows error message.

21. the device that the mistake that is used at first data and second data detects/corrects, described first data equate originally with described second data, the 5th check code produces after to described first data operation according to algorithm, and described device comprises:

Memory module, described memory module are used to store described first data, described second data and described the 5th check code;

Computing module, described computing module are used for producing the 6th check code according to described first data and described algorithm, and produce the 7th check code according to described second data and described algorithm;

First comparison module, described first comparison module are used for more described the 5th check code and described the 6th check code, and more described the 5th check code and described the 7th check code; And

Judge module, if the comparative result of described first comparison module shows described the 5th check code and equals described the 6th check code, and described the 5th check code equals described the 7th check code, the described memory module of controlling then described judge module continues to store described first data, described second data and described the 5th check code, and does not revise described first data, described second data and described the 5th check code.

22. device according to claim 21, if the comparative result of wherein described first comparison module shows described the 5th check code and equals described the 6th check code, and described the 5th check code is not equal to described the 7th check code, and then described judge module replaces described second data with described first data.

23. device according to claim 21, wherein, if the comparative result of described first comparison module shows described the 5th check code and is not equal to described the 6th check code, and described the 5th check code equals described the 7th check code, and then described judge module replaces described first data with described second data.

24. device according to claim 21, described device further comprises:

Second comparison module, if the comparative result of described first comparison module shows described the 5th check code and is not equal to described the 6th check code, and described the 5th check code is not equal to described the 7th check code, more described first data of then described second comparison module and described second data; If the comparative result of described second comparison module shows described first data and equals described second data that then described judge module replaces described the 5th check code with described the 6th check code.

25. device according to claim 24, described device further comprises:

Display module is not equal to described second data if the comparative result of described second comparison module shows described first data, and then described display module shows error message.

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